Hydraulically operated friction means and pump therefor



Nov. 27, 1956 J. D. MOONEY ,9

HYDRAULICALLY OPERATED FRICTION MEANS AND PUMP THEREFOR Original Filed May 18. 1949 4 Sheets-Sheet 1 FIG.I.

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INVENTOR.

JOHN D: moouev q WW4;

ATTORN :EYS

Nov. 27, 1956 J. D. MOONEY HYDRAULICALLY OPERATED FRICTION MEANS AND PUMP THEREFOR Original Filed May 18; 1949 4 Sheets-Sheet 2 o 4 s 8 2 M w v H MM /4 m N F mm m Y A VN T Mm m A M. D N H 0 J A Q. Q B ml. 8 A 5 n W M F. B m

5 D 6 W F m Original Filed May '18. 1949 Nov. 27, 1956 J. D. MOONEY 2,771,974

HYDRAULICALLY OPERATED FRICTION MEANS AND PUMP THEREFOR 4 Sheets-Sheet 3 mmvron JOHN D. MOONEY ATTORNEYS I Nov. 27, 1956 J. D. MOONEY HYDRAULICALLY OPERATED FRICTION MEANS AND PUMP THEREFOR Original FiledMay 18, 1949 4 Sheets-Sheet 4 INVENTOR.

JOHN D. MOONEY Y ATTORNZS United States Patent HYDRAULICALLY OPERATED FRICTION MEANS AND PUMP THEREFOR John Daniel Mooney, St. Paul, Minn.

Original application May 18, 1949, Serial No. 93,945, now

Patent No. 2,669,971, dated February 23, 1954. Dividg7a516d9 this application October 27, 1952, Serial No.

4 Claims. (Cl. 19218) The present invention relates to hydraulic reversing transmission mechanism for 'marine power plants.

Among the objects of the invention is to provide a smoothly acting reliable reverse mechanism that will be positive in its action, simple in construction and opera- I tion, and one which will be economical to produce.

A further object is to provide oil pressure producing means for the operation of said mechanism so constructed and mounted that it automatically compensates for any misalignment of the drive shaft due to wear or other reason. 1

Further objects will readily occur to those skilled in the art upon reference to the following'description and the accompanying drawings in which Fig. 1 is a vertical central longitudinal sectional view of the transmission. 7

Fig. 2 is a section of the control valve therefor on line 2-2 of Fig. 1.

Fig. 3 is a section on line 33 of Fig. 2'.

Fig. 4 is a section on line 44 of Fig. 1.

Fig. 5 is a view in elevation of the pump assembly looking toward the left as of Fig. 1.

Fig. 6 is a sectional view on line'6-6 of Fig. 1.

Fig. 7 is a sectional view taken on line 7 7 of Fig. 1.

Fig. 8 is a part sectional view of one ofthe pistons taken substantially on line 88 of Fig. 9.

Fig. 9 is an enlarged section of acylinder and piston. Figs. 10, 11 and 12 show diagrammatically the operation of the transmission, showing respectively the forward, neutral? and reverse positions of the parts.

Fig. 13 is a section on line 13-13 of Fig. 4.

Figs. 14 and 15 are central longitudinal sectional views of the clutch bleed valve, showing the valve in twopositions.

Fig. 16 is a view in elevation of the oil pump. 1 Referring to the drawings, the transmission is seen to comprise -a housing 20 having at one end an integral end v the cover, plate 20B is a second flanged stub shaft 22 adapted to be bolted by means of its flange to the propeller shaft (not shown). The two stub shafts 21 and 22 are in axialvalignment and their reduced inner ends closely approach each other near the central portion of the hous- As shown, the driven shaft 22 is mounted in the cover plate 20B in suitable antifriction bearings 22A, and has splined on its inner end a bevel gear 23 mounted in the ball bearing23A carried in an axial extension 24A of a spider 24 which spider carries a plurality of bevel gears 25 adapted to mesh with the gears23, p

Also adapted to mesh with gears 25in another bevel gear26 splinedto the innerend of the driving stub shaft "ice 2 i- 21. The gear 26 is rotatably mounted in the bearing 26A in an axial extension 24B of spider 24. The several gears 25, only one of which is shown, are rotatably mounted on radial pins 240. The hub 24D of the spider is rotatably carried on the reduced ends of the shafts 21 and 22.

This gearing arrangement is similar to a conventional diflerential gearing and will be so called hereinafter.

The outer cylindrical face of spider 24 is provided with splines upon which are carried the plates 30 and 31 of a clutch and brake, their intervening and cooperating clutch plates being numbered 30A and 31A respectively.

Interposed between cover plate 20B and the housing 20 is a ring shaped member 40 consisting of two rings 40A and 40B, the first of which consists of an internally splined ring carrying on its splines the brake plates 31A. The other ring 40B includes an annular cylinder 41 open toward the brake plates and opposite thereto. In the cylinder 41 is an annular piston 42 adapted to be moved outwardly of the cylinder against the brake plates 31 and 31A and clamp these together between itself and the flange 40C of ring 40A. The rings 40A and 40B are, as shown, fixed against rotation.

The plates 30 and 30A are, as shown, splined on spider 24 and within a ring member 50, respectively, the latter being similar in form to ring 40A but fixed to the periphery of a disc 50A. In the disc 50A is an annular cylinder 51 within which is mounted an annular piston 51A in position to act upon the plates 3030A to clamp them together between itself and the flange of ring 50. The disc 50A is carried on shaft 21 and is fixed to the gear 26.

Between the end wall 20A and the disc 50A is located a pump assembly designed as a whole by the numeral 60. This consists of a plate 60A, shown more in detail in Fig. 5, within which are formed an inlet chamber 60C communicating with an inlet passage 60D which in turn is open to the conduit 61 leading from the filter chamber 61A in the bottom of housing 20. Chamber 61A contains the screen indicated at 61B in Figs. 10, ll and 12. Plate 60A also contains an outlet chamber 62 which is open to a discharge conduit 62A, the outer end of which communicates with a channel 623 formed in the end face 20A of the housing 20. i

In the face of plate 60A is provided a circular seat for the outer internally toothed member 63 of a fluid pump and keyed to shaft 21 is the inner externally toothed member 63A, these two constituting a well known type of fluid pump. Over the seat for the pump members 63 and 63A is a suitable cover plate 64 provided with a packing ring 64A. The enire pump assembly is, as shown, supported by the shaft 21 and upon a suitable antifriction bearing 64C, the inner race of which is shown as a hardened ring 64D mounted on the shaft. This latter, however, may be eliminated if desired by local hardening of the shaft itself. A

The pump assembly comprising plate 60A, pump memers 63 and 63A, and cover 64 is rotatably carriedon shaft 21 and in a suitable flanged rang 65 bolted to the inside of the housing part 20A. The ring '65 is, however, somewhat larger than the plate 60A and where the part 64 projects through wall 20A, there is provideda small clearance 66, so that the pump assembly floats on shaft 21 and may move a short distance in any radial'direction. And since there can be such relative movement between the pump 60 and wall 20A, suitable packings 64B will b used at the ends of conduits 62A and 60D.

The conduits 61 and 62B, together with conduits 67 and 67A, are formed as channels in the outer face of wall 20A and covered by suitable plates 67B. At their upper ends, the conduits 62B, 67 and 67A are open to passages bored in the upper thickened wall of housing 20 and passage 62B, the pump discharge passage connected to one side of a cooling device 68 (see Fig. 12) from serve also to prevent rotation of the pistons relative to their respective cylinders.

The operation of the transmission seems obvious in view of the foregoing and will not be described in detail other than to state that with the control valve in the central position of Fig. 10, oil from the pump will pass through the valve and spill back into the housing.

If it is desired to drive the shaft 22 and propeller shaft in a forward direction, the valve is moved to the position of Fig. 9 and thereby oil under pressure is supplied to the left hand (Fig. 1) clutch 30 to lock the spider 24 to shaft 21 and produce a direct drive.

If it is desired to drive the shaft 22 in reverse, the valve is moved to the position of Fig. 11 and thus oil delivered to brake 31 to lock the spider 24 against rotation and simultaneously release clutch 30.

This is a divisional application of my copen-ding application Serial No. 93,945, filed May 18, 1949, now Patent #2,669,971, issued February 23, 1954.

I claim:

1. In a hydraulically operated transmission mechanism having a housing, a driving shaft extending through a wall thereof, a driven shaft extending from said housing and a hydraulically operated friction clutch for connecting the two shafts in driving relation, a pump for supplying fluid under pressure to said clutch, and means for supporting said pump on said driving shaft and means carried by said wall for preventing movement of said pump longitudinally of said driving shaft while permitting lateral movement relative to said wall.

2. In a hydraulically operated transmission mechanism having a housing, a driving shaft extending through a wall thereof, a driven shaft extending from said housing and a hydraulically operated friction clutch for connecting the two shafts in driving relation, a pump for supplying fluid under pressure to said clutch, a disc-like housing for said pump surrounding and supported on said driving shaft, means carried by said wall for preventing rotation of said housing while permitting edgewise movement thereof.

3. In a hydraulic transmission having a housing, a driving shaft passing through an opening in a wall thereof, a driven shaft, and fluid pressure operated means in said housing for connecting the two shafts in driving relation, a gear pump for supplying said fluid under pressure, a housing for said pump comprising a disc-like member surrounding and supported upon said driving shaft and having in one face thereof a pump chamber, a cover plate for said chamber, and means for fixing said disc-like member to the inner face of said wall and in floating relation thereto.

4. In a transmission having hydraulically operated means therein, and a driving and driven shaft connectible in driving relation by said means, a pump for supplying pressure fluid to said means, a housing for said transmission, said pump being mounted in said housing in floating relation thereto, conduits leading from said pump to said means, said conduits being partly in said housing and partly in said floating pump mounting and means for connecting said conduit parts including a packing seat of greater diameter than adjacent conduit portions and a circular cross section packing ring of resilient material in said seat of less diameter normally than said seat but greater diameter than said conduit.

References Cited in the file of this patent UNITED STATES PATENTS 1,880,108 Ross Sept. 27, 1932 2,326,170 Rearmin Aug. 10, 1943 2,328,090 Nutt et a1. Aug. 31, 1943 2,498,123 Hobbs Feb. 21, 1950 2,614,396 Ratermann Oct. 21, 1952 2,674,220 Ware Apr. 6, 1954 

